Conservative author and commentator Ann Coulter said Wednesday that she will not speak at UC Berkeley, saying that the group sponsoring her event was no longer supporting her appearance after an ongoing debate about security at the university.

"I'm so sorry Berkeley canceled my speech. I'm so sorry (Young Americans Foundation) acquiesced in the cancellation," Coulter tweeted. "I'm very sad about Berkeley's cancellation but my sadness is greater than that. it is a dark day for free speech in America."

"And I'm so sorry for free speech crushed by thugs. It's sickening when a radical thuggish institution like Berkeley can so easily snuff out the cherished American right to free speech," Coulter tweeted.

As part of a series of tweets, Coulter thanked television personalities Bill Maher, Chris Matthews and Margaret Carlson "for opposing Berkeley's censorship."

I’m very sad about Berkeley's cancelation, but my sadness is greater than that. It is a dark day for free speech in America.